Hi dr. Bergstrom!
I have a question about obtaining volumetric coefficients for an elastomeric material.
I have performed monotonic uniaxial tests and confined compression tests. From uniaxial tests I have calibrated hyperelastic models assuming incompressibility. In combination with volumetric test data in view of pressure-volume ratio I have evaluated the volumetric coefficients in abaqus.
My question is what is the necessary data for confined compression in Mcalibration? Is it pressure and volumetric strain (positive or negative)? What is the recommended maximum value of the volumetric strain? Should uniaxial and confined compression be calibrated together like in ABQ?
Also Yeoh strain energy potential has D1, D2 and D3 in Abaqus and in MCalibration its just kappa.
What is the best way to introduce some compressibility in the numerical analysis, the initial bulk modulus or a secant value or nonlinear approach?
Thank you very much in advance!!!